Abstract
We study thermodynamics of strongly coupled lattice QCD with two colors of staggered fermions in dimensions. The partition function of this model can be written elegantly as a statistical mechanics of dimers and baryon loops. The model is invariant under an symmetry. At low temperatures, we find evidence for superfluidity in the symmetry sector while the symmetry remains unbroken. The finite temperature phase transition appears to belong to the Kosterlitz-Thouless universality class, but the superfluid density jump at the critical temperature is anomalously higher than the normal value of . We show that, by adding a small symmetry breaking term to the model, the superfluid density jump returns to its normal value, implying that the extra symmetry causes anomalous superfluid behavior. Our results may be of interest to researchers studying superfluidity in spin-1 systems.
- Received 23 August 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.182001
©2006 American Physical Society